Improvement in forge-bonnets



w, 'DUNKEnw lmprovemnt in Forge-Bonnets.. No.114,115. ParentedApr1|25,187s

timidi ndert WALTER DUNKERLY, OF WOONSOOKET, RHODE ISLAND.

Letters Patent N o. 114,115, dated April 25, 1871 IMPROVEMENT IN FORGE-BONNETS.

The Schedule referred to in these Letters Patent and making part of the lama.

To all whom it may conce/rn Be it known that I, WALTER DUNKERLY, of Woonsocket, in the county oi'Providence and State of Rhode Island, have invented a new and val uable Improvement in I iorge-Furnaces and I do hereby declare that'the following is a full, clear, and exact description of the construction and operation ofthe same, reference being had to the annexed drawing `making a part of this speciiication and to the letters and lgures of reference marked thereon.

Figure l of the drawing is a plan view of my invention with the bonnet thrown back.

Figure 2 is a side view.

Figures 3 and 4 are central vertical sections.

My invention has relation to an improvement in fbrge-furnaces; and

It consists in the construction and novel arrangement of devices designed to enable the bonnet to be removed from the tire at a moments'warning, as hereinafter described.

The letterA ofthe drawing designates a Vbase piece or rim, which is seated on the'top of the forge-frame Surrounding the fire; l

Ihis base rim is provided with a projection or ledge, B, extending to the rear, and serving as a rest for the bonnet when it is' thrown back.

The base rim is made upwardlyaring in such a manner that it will receive the base of the forge-bonnet within it when the bonnet is thrown forward over the lire. lhe upper edge of the rim is notched at each side to correspond with the openings in the base ofthe forge-bonnet.

(l represents the forge-bonnet, which may be of any desirable form. It is preferably made in the form of an. oval dome.

D D representthe doors,`whieh clos'e the openings E at the base ofthe bonnet on each side.

F designates the bore or aperture at the top of the bonnet for thc escape ofthe gases.

G represents the sight-hole, usually placed between the bore and the opening E, and designed to permit a view of theirons. Y

The sight-hole is provided with a pivoted stop, H, arranged to swing into place over the hole when the displacing force is removed.

Ihe bonnet is usually formed of plate metal, and its exterior surface should be polished or brightened in order to retard radiation.

From the base of the bonneta ledge, k, extends inwardly around the entire circumference, passing over the openings E E byan upward bend, Z, at each point.

L designates a lining of cement, fire-brick, or other non-conducting substance, with which the interior of the bonnet is coated. This lining extends inwardly until it is flush with the edge ofthe ledge k.

'lhe bore F in its passage through the` lining is made upwardly tapering. So, also, is the passage through the lining which leads to the sight-hole.

The upward bends Z of the ledge` K serve to proteet the openings E E, and to keep the lining tiom becoming abraded or breaking away above these openlngs.

rlhe bonnet is attached to the base rim A by means of a hinge, m. I

Z represents a crank, whereby the bonnet may be moved ou its hinge. Usually the shaft to which the crank is attached is an extension of the pivot-rod of' the hinge, this pivot-rod, lettered c on the drawing, being rigidly keyed or attached to the lugs of the bounet. Instead of a crank the bonnet may be moved by means of a wheel.

The entire attachment, both rim and bonnet, being removable, can be used or not, as may be desirable.

When in use the bonnet should be thrown back until the re is kindled and the coarser products of combustion have passed oii. The bonnet is then thrown over the iire, and the forge-furnace is ready for the introduction of the irons.

Having now described the construction and operation of my invention,

What I claim, and desire to secure by .Letters Patent, is-

1. The bonnet C, constructed substantially as described. l

2. Joint-ly, the bonnet C and base rim A, hinged together, substantially as specified.

In testimony7 that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

WALTER DUN KERLY.

Witnesses:

HENRY Honnonn ItoBInsoN, DANIEL M. EDWARDS. 

